body {
  margin-top: 80px;
  /* 100px is double the height of the navbar - I made it a big larger for some more space - keep it at 50px at least if you want to use the fixed top nav */
}
body footer {
  margin: 50px 0;
}
body .gap {
  margin: 25px 0;
}
body .title {
  font-size: x-large;
  font-weight: bold;
  font-family: 'SimHei';
}
body hr {
  color: black;
}
body .form-sign {
  max-width: 450px;
  padding: 20px;
  margin: 0 auto;
}
body input {
  margin-bottom: 5px;
}
